The SUB active subwoofer series adopts a new exterior structure and a new surface painting process to form a low-frequency speaker. The bass unit adopts a high-power voice coil with built-in high cut function. The high-power amplifier module without balanced network is designed without protection to minimize interference and improve sound quality. It can provide excellent low-frequency performance for applications such as mobile performances, churches, auditoriums, multifunctional halls, and small and medium-sized conference rooms. It can provide high sound pressure levels and has excellent performance in ultra-low frequency dynamic music.